Rare photo of Srila Prabhupada in Caracas, Venezuela (mid-seventies)
"There may be many great souls -- jnanis, yogis and bhaktas, or pure devotees, are also called great souls -- but they are very rarely found. One can find many great souls amongst yogis and jnanis, but a truly great soul, a pure devotee of the Lord, who is fully surrendered to the Lord, is very rarely found (sa mahatma sudurlabhah, Bg. 7.19). A devotee's mind is always calm, quiet and desireless because he is always anyabhilasita-sunyam, having no desire other than to serve Krsna as His personal servant, friend, father, mother or conjugal lover. Due to his association with Krsna, a devotee is always very calm and cool."
(Srimad-Bhagavatam, 4.24.20, Purport)